test: Remove unused code in check-networking-firewall
test: Remove unused code in check-networking-firewall

Lets remove the unused code in this file.

Closes #9080
stefwalter/cockpit,stefwalter/cockpit,cockpituous/cockpit,stefwalter/cockpit,deryni/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,andreasn/cockpit,cockpit-project/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,deryni/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,garrett/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpituous/cockpit,martinpitt/cockpit,mareklibra/cockpit,mvollmer/cockpit,stefwalter/cockpit,andreasn/cockpit,deryni/cockpit,andreasn/cockpit,deryni/cockpit,garrett/cockpit,andreasn/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,stefwalter/cockpit,mvollmer/cockpit,andreasn/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,mareklibra/cockpit,deryni/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,deryni/cockpit,andreasn/cockpit,cockpit-project/cockpit,deryni/cockpit,andreasn/cockpit,mareklibra/cockpit,martinpitt/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,garrett/cockpit,garrett/cockpit,cockpit-project/cockpit,garrett/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpituous/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit